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Crap! Noticed that winehq-staging v3.18 and v3.19 seem to be causing me some grief. I think it's related to the windows d3dx9_43 library. Unfortunately I don't have time to work out what will fix my issue, so therefore I've done the following to keep my FG running smoothly:

That keeps me using winehq-staging v3.17 and will block further updates of wine.
If someone else has bumped into this problem and worked out the solution, love to know. For the moment, my IRL job has taken away the time i'd like to spend on working out why a new release of wine breaks things. Shouldn't happen ... but directx 9 is like ... oof ... so old!

About the Install...
This is for a 64bit install. x64 FG comes up after installing via POL. There was an error during install, but it was ignored per the OP directions. This was the same error as encountered during the 32 bit install.

On first run...
FG looks brilliant! Try to load a campaign... Crash. This was the same error as encountered during the 32 bit install.

All subsequent attempts...
Switched wine versions in POL config for the prefix to 2.6, and FG is up, but there are no fonts. Like before Wine Mono Installer and Wine have invisible or ultra tiny windows with no fonts.

POL debug shows the following...
...http://www.freetype.org
Wine cannot find the FreeType font library. To enable Wine to
use TrueType fonts please install a version of FreeType greater than
or equal to 2.0.5.http://www.freetype.org
err:syslink:SYSLINK_SetFont Failed to create link font!
...

1. Installed from uefi usb with Fedora 20 Workstation ... using these steps to create the usb stick and install Fedora. https://docs.fedoraproject.org/en-US...llation-image/
2. Install Play On Linux (PoL), Wine, and Mono ... sudo dnf install playonlinux wine mono-core
3. Test PoL by installing notepad++ from the install list ... just use search in PoL. Notepad++ triggers the installation of wine 3.0.3. Test Notepad++. If it works, continue. I've never had an issue, but you never know.
4. Install FG using the same basic approach in the OP, but instead pick "Use another version of Wine" and select the already installed 3.0.3 32bits version that Notepad++ installed. You should run into no errors.

Testing Done... loaded several campaigns from several rulesets: D&D 5E, 4E, and StarFinder.
Stay tuned for testing results on the GM and Player side.

I have set FG to use the same drive for Data & Apps in settings, and Windows and Linux version both run fine. However, I do have to update twice, once in Windows, and once in Linux, whenever there is an update, which seems odd. I assume that the launcher stores the latest update in the Steam folder, which is separate for Windows and Linux.